[Stoves] Update on new approach: Simple natural draft TLUD

[Jock Gill]

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Primary air holes @ 7/16ths

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Vent holes.  Outer ring has 33 holes of 1/4 inch.  Inner rowing has 20 holes of 5/16ths.

The secondary air is pulled into the fire via the Venturi effect.  Hot gases rising pull in the cooler, but per-heated, secondary air that rise between the cap can and the reactor can.  Note: It appears that the diameter of the cap with vent holes divided by the diameter of the reactor can should be at least 1.6

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The rector can can is about 6 inches in diameter.  It started life as a three pound Costco coffee can.

The cap sits on three angle brackets that create a gap of about 3 MM between the top of the reactor and the cap.  The secondary air enters through this 360 degree gap.  The cap extends about 2 CM down the sides of the reactor can.

The photo show the system as configured for my last test.  Achieved 1,000 F in the draft can on top.  Made some pretty good charcoal too.  450 grams of softwood pellets went for about 37:30.

The performance/results can be varied by the height of, or absence of, the draft can.  Also vent holes can be filled with bolts to reduce the draft.  Runs times can be extended to 50 minutes, but there will be quite a few pellets that are not charred or are only partially charred.  Longer run times have, not surprisingly, lower temperature yields.

A 20 second video to follow.  As you will see, this is not a completely smoke free set up at this stage of development.  Some tuning appears to be required.  Perhaps 1000 grams of fuel, as 450 grams leaves most of the reactor can empty.  More fuel will modify the draft forces.  Could be good or could be bad.

Thoughts?  Suggestions?

Cheers,

Jock

Jock Gill
P. O. Box 3
Peacham, VT 05862

Cell: (617) 449-8111

Extract CO2 from the atmosphere!